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authorT Michael Turney <mturney@codeaurora.org>2019-08-07 14:25:58 -0700
committerJulius Werner <jwerner@chromium.org>2019-11-01 01:16:47 +0000
commit99bf4366a6184f08bda0c4cbabea384bfe995bfa (patch)
treeccdd8660e934492747774f9c24189a809b7e5758
parent626a53776b2915d7f27a8a97f9d84200b20f3079 (diff)
downloadcoreboot-99bf4366a6184f08bda0c4cbabea384bfe995bfa.tar.xz
sc7180: support bitbang UART w/gpio
Change-Id: I21b149500849eceea663d18a0880c6443ae47d9b Signed-off-by: T Michael Turney <mturney@codeaurora.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35498 Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
-rw-r--r--src/soc/qualcomm/sc7180/Kconfig2
-rw-r--r--src/soc/qualcomm/sc7180/Makefile.inc4
-rw-r--r--src/soc/qualcomm/sc7180/uart_bitbang.c52
3 files changed, 58 insertions, 0 deletions
diff --git a/src/soc/qualcomm/sc7180/Kconfig b/src/soc/qualcomm/sc7180/Kconfig
index 2cd1d6355b..70737e9379 100644
--- a/src/soc/qualcomm/sc7180/Kconfig
+++ b/src/soc/qualcomm/sc7180/Kconfig
@@ -11,6 +11,8 @@ config SOC_QUALCOMM_SC7180
select HAVE_MONOTONIC_TIMER
select ARM64_USE_ARCH_TIMER
select SOC_QUALCOMM_COMMON
+ select HAVE_UART_SPECIAL
+ select BOOTBLOCK_CONSOLE
if SOC_QUALCOMM_SC7180
diff --git a/src/soc/qualcomm/sc7180/Makefile.inc b/src/soc/qualcomm/sc7180/Makefile.inc
index 8b65dddf1e..bd2a134216 100644
--- a/src/soc/qualcomm/sc7180/Makefile.inc
+++ b/src/soc/qualcomm/sc7180/Makefile.inc
@@ -7,11 +7,13 @@ bootblock-y += mmu.c
bootblock-y += timer.c
bootblock-y += spi.c
bootblock-y += gpio.c
+bootblock-$(CONFIG_DRIVERS_UART) += uart_bitbang.c
################################################################################
verstage-y += timer.c
verstage-y += spi.c
verstage-y += gpio.c
+verstage-$(CONFIG_DRIVERS_UART) += uart_bitbang.c
################################################################################
romstage-y += cbmem.c
@@ -22,6 +24,7 @@ romstage-y += ../common/mmu.c
romstage-y += mmu.c
romstage-y += spi.c
romstage-y += gpio.c
+romstage-$(CONFIG_DRIVERS_UART) += uart_bitbang.c
################################################################################
ramstage-y += soc.c
@@ -29,6 +32,7 @@ ramstage-y += cbmem.c
ramstage-y += timer.c
ramstage-y += spi.c
ramstage-y += gpio.c
+ramstage-$(CONFIG_DRIVERS_UART) += uart_bitbang.c
################################################################################
diff --git a/src/soc/qualcomm/sc7180/uart_bitbang.c b/src/soc/qualcomm/sc7180/uart_bitbang.c
new file mode 100644
index 0000000000..fa0eac8fa7
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/uart_bitbang.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ * Copyright 2019 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/uart.h>
+#include <gpio.h>
+#include <types.h>
+#include <boot/coreboot_tables.h>
+
+#define UART_TX_PIN GPIO(44)
+
+void uart_fill_lb(void *data)
+{
+
+}
+
+static void set_tx(int line_state)
+{
+ gpio_set(UART_TX_PIN, line_state);
+}
+
+void uart_init(int idx)
+{
+ gpio_output(UART_TX_PIN, 1);
+}
+
+void uart_tx_byte(int idx, unsigned char data)
+{
+ uart_bitbang_tx_byte(data, set_tx);
+}
+
+void uart_tx_flush(int idx)
+{
+ /* unnecessary, PIO Tx means transaction is over when tx_byte returns */
+}
+
+unsigned char uart_rx_byte(int idx)
+{
+ return 0; /* not implemented */
+}